package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetMealDishMapper setMealDishMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    @Transactional//保证事物的原子性
    public void savaWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品中插入一条数据
        dishMapper.insert(dish);

        //获取insert语句产生的id值
        Long id = dish.getId();
        log.info("插入菜品后产生的id:{}",id);

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(id));
            //向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.page(dishPageQueryDTO);
        PageResult pageResult = new PageResult(page.getTotal(),page.getResult());
        return pageResult;
    }

    /**
     * 删除菜品
     * @param ids
     */
    @Transactional
    @Override
    public void delete(List<Long> ids) {
        //该菜品是否起售
        for (Long id : ids) {
            Dish dish =  dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //查询该菜品下是否关联其他套餐
        List<Long> dishId = setMealDishMapper.getById(ids);
        if(dishId != null && dishId.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        for (Long id : ids) {
//            //删除菜品
//            dishMapper.deleteById(id);
//            //删除菜品口味
//            dishFlavorMapper.deleteById(id);
//        }
        //删除菜品
        dishMapper.deleteByIds(ids);
        //删除菜品口味
        dishFlavorMapper.deleteByDishId(ids);

    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishDTO getById(Long id) {
        DishDTO dishDTO = new DishDTO();

        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavor = dishFlavorMapper.getByDishId(id);

        BeanUtils.copyProperties(dish, dishDTO);
        dishDTO.setFlavors(dishFlavor);

        return dishDTO;
    }

    /**
     * 更新菜品
     * @param dishDTO
     */
    @Override
    @Transactional//保证事物的原子性
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        //修改口味表 先删除后添加（因为口味表可能是删除也可能是添加）
        dishFlavorMapper.deleteByDishId(Collections.singletonList(dishDTO.getId()));

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 启用禁用菜品
     * @param dishDTO
     */
    @Override
    public void startOrStop(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     */
    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        List<Dish> dish1 = dishMapper.getByDish(dish);
        return dish1;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.getByDish(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
